The Wera 8784 B1 Zyklop Bit Adaptor 38in Square Drive with Rapidaptor technology provides rapid bit change without any extra tools and also only requires one handed use Rapid-in allows the bit to be inserted without moving the sleeve thanks to a self-lock mechanism the bit automatically locks in securely Rapid-out allows for the bit to be changed by simply pushing the sleeve forward this works via a spring mechanism lifting the bit off the magnet Rapid-spin a free-turning sleeve that allows screw steadying at the start of the screwdriving process This makes it easier to apply the tool to the screw and also prevents any slipping from occurring Rapidaptor quick-release chucks hold 14in bits as per DIN ISO 1173-C 63 Wera series 1 and E 63 Wera series 4